The Removal of Metallic Single-Walled Carbon Nanotubes Using an Aqueous Two-Phase System

Tang, M.S.Y. and Whitcher, T.J. and Yeoh, K.H. and Chua, C.L. and Woon, K.L. and Show, P.L. and Lin, Y.K. and Ling, T.C. (2014) The Removal of Metallic Single-Walled Carbon Nanotubes Using an Aqueous Two-Phase System. Journal of Nanoscience and Nanotechnology, 14 (5). pp. 3398-3402. ISSN 1533-4880

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Official URL: http://www.ingentaconnect.com/content/asp/jnn/2014...

Abstract

Here we report our findings on the removal of metallic single-walled carbon nanotubes using an aqueous two-phase system. The aqueous two-phase system contained as received carbon nanotubes, polyethylene glycol, dextran, N-methylpyrrolidone, cetyltrimethylammonium bromide, and water which phase separated into top and bottom phases. The top phase was dominated by polyethylene glycol whereas the bottom phase was dominated by dextran. The dextran-rich phase contained more semiconducting species while metallic species was more abundant in the polyethylene glycol rich-phase. It was found via Fourier-Transform Infrared Spectroscopy that cetyltrimethylammonium bromide only present in the dextran-rich phase. A selectivity mechanism is tentatively proposed and discussed.

Item Type: Article
Uncontrolled Keywords: Metallic Single-Walled Carbon Nanotubes; Aqueous Two-Phase System
Subjects: Q Science > Q Science (General)
Divisions: Faculty of Science
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 10 Mar 2015 06:38
Last Modified: 10 Mar 2015 06:38
URI: http://eprints.um.edu.my/id/eprint/12984

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